Horizontal Amplifier Gain

Calibration Procedure For Oscilloscope Os-266(P)/U And Types 7844/R7844 Page Navigation
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TB 9-6625-2131-24

(3) Measure risetime, using standard risetime technique. Risetime will be 250 ns or

less.

b. Adjustments. No adjustments can be made.

11. Horizontal Amplifier Gain

a. Performance Check

(1) Adjust BEAM 2 INTEN and FOCUS controls for convenient display.

(2) Install time base in RIGHT VERT compartment and standardizer in B HORIZ

compartment.

(3) Set standardizer TEST switch to VERT or HORIZ COM MODE and time base

MODE switch to AUTO. If vertical trace is not within +0.5 minor division of center vertical

graticule line, perform b (1) and (2) below.

(4) Set standardizer TEST switch to VERT or HORIZ GAIN position and REP

RATE switch to 1 MHz. Adjust standardizer POSITION control to align bright center

trace with crt vertical graticule centerline. If display does not indicate 1 trace per graticule

division within 0.5 minor division over center 8 divisions, perform b (3) below.

(5) Adjust BEAM 2 INTEN control fully ccw.

(6) Move time base to LEFT VERT compartment.

(7) Set BEAM 1 HORIZONTAL MODE switch to B.

(8) Set standardizer TEST switch to COM MODE and adjust BEAM 1 INTEN

control for a suitable display. If horizontal centering of trace is not within 0.5 minor

division of crt center graticule line, perform b (4) below.

(9) Set standardizer TEST switch to VERT or HORIZ GAIN position and REP

RATE switch to 1 MHz. Adjust standardizer POSITION control to align bright center

trace with crt vertical graticule centerline. If display does not indicate 1 trace per graticule

division within 0.5 minor division over center 8 divisions, perform b (5) below.

b. Adjustments

(1) Adjust SYMM A19 R1838 and SYMM A20 R2838 (fig. 4) (fig. 5 for type R7844) to

midrange.

(2) Adjust HORIZ CTR A20 R2940 (fig. 4) (fig. 5 for type R7844) to align trace with

crt center vertical graticule line.

(3) Adjust HORIZ GAIN A20 R2816 (fig. 4) (fig. 5 for type R7844) for 1 division

between each of 9 traces displayed on crt.

(4) Adjust HORIZ CTR A19 R1940 (fig. 4) (fig. 5 for type R7844) to align trace with

crt center vertical graticule line.

(5) Adjust HORIZ GAIN A19 R1816 (fig. 4) (fig. 5 for type R7844) for 1 division

between each of 9 traces displayed on crt.